mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mrow><mn>2</mn><mo>-</mo><mfrac><mn>1</mn><mn>3</mn></mfrac></mrow></mfenced><mfenced><mrow><mn>2</mn><mo>-</mo><mfrac><mn>3</mn><mn>5</mn></mfrac></mrow></mfenced><mfenced><mrow><mn>2</mn><mo>-</mo><mfrac><mn>5</mn><mn>7</mn></mfrac></mrow></mfenced><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mfenced><mrow><mn>2</mn><mo>-</mo><mfrac><mn>997</mn><mn>999</mn></mfrac></mrow></mfenced></math>